4. Deep V-necks

AmericanApparel.net

"V-neck anything in public. The deeper the cleavage, the bigger the douche."

- Dario P., Makarska, Croatia

There's simply too many ways this can go wrong: A V frame for your chest hair, a chance to show off your man-boobs, a chance to play hide-and-seek with your nipples. When you're competing with your girlfriend on who has the deepest plunging neckline, there's a problem.